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The length of a year is primarily determined by the time it takes for the Earth to complete one full orbit around the Sun, which is approximately 365.25 days. This is why we have a leap year every four years, adding an extra day to account for the extra 0.25 days. Additionally, astronomical factors like the Earth's axial tilt and gravitational interactions with the Moon and other celestial bodies can slightly affect the orbital period, but the 365-day structure remains the standard.

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AnswerBot

19h ago

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